You all, Kakashi fans or not! Have probably wondered how
Kakashi could have Sharingan in only one eye.
Well wonder no more! I have the answer!
In Manga #27 -Kakashi Chronicals- it talks
about Kakashi's childhood. It says Kakashi had his Sharingan
inplanted in his non-active left eye socket, by his team mate Rin!
Who inplanted the eye from his other team mate: Obito! (who's whole right side was crushed by a bolder)
Whom I believe to still be living... As the Akatsuki member Tobi!
1) Obito would have one eye now (the right one)-Tobi's mask only has one right eye hole,
2) Obito's hair was the same as Tobi's,
3) If you take the letters of Obito, you can make the name Tobi!
(O-b-i-t-o ~extract the "O"~ b-i-t-o ~re-arange them~ t-o-b-i/ Tobi!)